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diff --git a/arch/sparc/include/asm/viking.h b/arch/sparc/include/asm/viking.h
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+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * viking.h: Defines specific to the GNU/Viking MBUS module.
+ * This is SRMMU stuff.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ */
+#ifndef _SPARC_VIKING_H
+#define _SPARC_VIKING_H
+
+#include <asm/asi.h>
+#include <asm/mxcc.h>
+#include <asm/pgtsrmmu.h>
+
+/* Bits in the SRMMU control register for GNU/Viking modules.
+ *
+ * -----------------------------------------------------------
+ * |impl-vers| RSV |TC|AC|SP|BM|PC|MBM|SB|IC|DC|PSO|RSV|NF|ME|
+ * -----------------------------------------------------------
+ * 31 24 23-17 16 15 14 13 12 11 10 9 8 7 6-2 1 0
+ *
+ * TC: Tablewalk Cacheable -- 0 = Twalks are not cacheable in E-cache
+ * 1 = Twalks are cacheable in E-cache
+ *
+ * GNU/Viking will only cache tablewalks in the E-cache (mxcc) if present
+ * and never caches them internally (or so states the docs). Therefore
+ * for machines lacking an E-cache (ie. in MBUS mode) this bit must
+ * remain cleared.
+ *
+ * AC: Alternate Cacheable -- 0 = Passthru physical accesses not cacheable
+ * 1 = Passthru physical accesses cacheable
+ *
+ * This indicates whether accesses are cacheable when no cachable bit
+ * is present in the pte when the processor is in boot-mode or the
+ * access does not need pte's for translation (ie. pass-thru ASI's).
+ * "Cachable" is only referring to E-cache (if present) and not the
+ * on chip split I/D caches of the GNU/Viking.
+ *
+ * SP: SnooP Enable -- 0 = bus snooping off, 1 = bus snooping on
+ *
+ * This enables snooping on the GNU/Viking bus. This must be on
+ * for the hardware cache consistency mechanisms of the GNU/Viking
+ * to work at all. On non-mxcc GNU/Viking modules the split I/D
+ * caches will snoop regardless of whether they are enabled, this
+ * takes care of the case where the I or D or both caches are turned
+ * off yet still contain valid data. Note also that this bit does
+ * not affect GNU/Viking store-buffer snoops, those happen if the
+ * store-buffer is enabled no matter what.
+ *
+ * BM: Boot Mode -- 0 = not in boot mode, 1 = in boot mode
+ *
+ * This indicates whether the GNU/Viking is in boot-mode or not,
+ * if it is then all instruction fetch physical addresses are
+ * computed as 0xff0000000 + low 28 bits of requested address.
+ * GNU/Viking boot-mode does not affect data accesses. Also,
+ * in boot mode instruction accesses bypass the split on chip I/D
+ * caches, they may be cached by the GNU/MXCC if present and enabled.
+ *
+ * MBM: MBus Mode -- 0 = not in MBus mode, 1 = in MBus mode
+ *
+ * This indicated the GNU/Viking configuration present. If in
+ * MBUS mode, the GNU/Viking lacks a GNU/MXCC E-cache. If it is
+ * not then the GNU/Viking is on a module VBUS connected directly
+ * to a GNU/MXCC cache controller. The GNU/MXCC can be thus connected
+ * to either an GNU/MBUS (sun4m) or the packet-switched GNU/XBus (sun4d).
+ *
+ * SB: StoreBuffer enable -- 0 = store buffer off, 1 = store buffer on
+ *
+ * The GNU/Viking store buffer allows the chip to continue execution
+ * after a store even if the data cannot be placed in one of the
+ * caches during that cycle. If disabled, all stores operations
+ * occur synchronously.
+ *
+ * IC: Instruction Cache -- 0 = off, 1 = on
+ * DC: Data Cache -- 0 = off, 1 = 0n
+ *
+ * These bits enable the on-cpu GNU/Viking split I/D caches. Note,
+ * as mentioned above, these caches will snoop the bus in GNU/MBUS
+ * configurations even when disabled to avoid data corruption.
+ *
+ * NF: No Fault -- 0 = faults generate traps, 1 = faults don't trap
+ * ME: MMU enable -- 0 = mmu not translating, 1 = mmu translating
+ *
+ */
+
+#define VIKING_MMUENABLE 0x00000001
+#define VIKING_NOFAULT 0x00000002
+#define VIKING_PSO 0x00000080
+#define VIKING_DCENABLE 0x00000100 /* Enable data cache */
+#define VIKING_ICENABLE 0x00000200 /* Enable instruction cache */
+#define VIKING_SBENABLE 0x00000400 /* Enable store buffer */
+#define VIKING_MMODE 0x00000800 /* MBUS mode */
+#define VIKING_PCENABLE 0x00001000 /* Enable parity checking */
+#define VIKING_BMODE 0x00002000
+#define VIKING_SPENABLE 0x00004000 /* Enable bus cache snooping */
+#define VIKING_ACENABLE 0x00008000 /* Enable alternate caching */
+#define VIKING_TCENABLE 0x00010000 /* Enable table-walks to be cached */
+#define VIKING_DPENABLE 0x00040000 /* Enable the data prefetcher */
+
+/*
+ * GNU/Viking Breakpoint Action Register fields.
+ */
+#define VIKING_ACTION_MIX 0x00001000 /* Enable multiple instructions */
+
+/*
+ * GNU/Viking Cache Tags.
+ */
+#define VIKING_PTAG_VALID 0x01000000 /* Cache block is valid */
+#define VIKING_PTAG_DIRTY 0x00010000 /* Block has been modified */
+#define VIKING_PTAG_SHARED 0x00000100 /* Shared with some other cache */
+
+#ifndef __ASSEMBLY__
+
+static inline void viking_flush_icache(void)
+{
+ __asm__ __volatile__("sta %%g0, [%%g0] %0\n\t"
+ : /* no outputs */
+ : "i" (ASI_M_IC_FLCLEAR)
+ : "memory");
+}
+
+static inline void viking_flush_dcache(void)
+{
+ __asm__ __volatile__("sta %%g0, [%%g0] %0\n\t"
+ : /* no outputs */
+ : "i" (ASI_M_DC_FLCLEAR)
+ : "memory");
+}
+
+static inline void viking_unlock_icache(void)
+{
+ __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
+ : /* no outputs */
+ : "r" (0x80000000), "i" (ASI_M_IC_FLCLEAR)
+ : "memory");
+}
+
+static inline void viking_unlock_dcache(void)
+{
+ __asm__ __volatile__("sta %%g0, [%0] %1\n\t"
+ : /* no outputs */
+ : "r" (0x80000000), "i" (ASI_M_DC_FLCLEAR)
+ : "memory");
+}
+
+static inline void viking_set_bpreg(unsigned long regval)
+{
+ __asm__ __volatile__("sta %0, [%%g0] %1\n\t"
+ : /* no outputs */
+ : "r" (regval), "i" (ASI_M_ACTION)
+ : "memory");
+}
+
+static inline unsigned long viking_get_bpreg(void)
+{
+ unsigned long regval;
+
+ __asm__ __volatile__("lda [%%g0] %1, %0\n\t"
+ : "=r" (regval)
+ : "i" (ASI_M_ACTION));
+ return regval;
+}
+
+static inline void viking_get_dcache_ptag(int set, int block,
+ unsigned long *data)
+{
+ unsigned long ptag = ((set & 0x7f) << 5) | ((block & 0x3) << 26) |
+ 0x80000000;
+ unsigned long info, page;
+
+ __asm__ __volatile__ ("ldda [%2] %3, %%g2\n\t"
+ "or %%g0, %%g2, %0\n\t"
+ "or %%g0, %%g3, %1\n\t"
+ : "=r" (info), "=r" (page)
+ : "r" (ptag), "i" (ASI_M_DATAC_TAG)
+ : "g2", "g3");
+ data[0] = info;
+ data[1] = page;
+}
+
+static inline void viking_mxcc_turn_off_parity(unsigned long *mregp,
+ unsigned long *mxcc_cregp)
+{
+ unsigned long mreg = *mregp;
+ unsigned long mxcc_creg = *mxcc_cregp;
+
+ mreg &= ~(VIKING_PCENABLE);
+ mxcc_creg &= ~(MXCC_CTL_PARE);
+
+ __asm__ __volatile__ ("set 1f, %%g2\n\t"
+ "andcc %%g2, 4, %%g0\n\t"
+ "bne 2f\n\t"
+ " nop\n"
+ "1:\n\t"
+ "sta %0, [%%g0] %3\n\t"
+ "sta %1, [%2] %4\n\t"
+ "b 1f\n\t"
+ " nop\n\t"
+ "nop\n"
+ "2:\n\t"
+ "sta %0, [%%g0] %3\n\t"
+ "sta %1, [%2] %4\n"
+ "1:\n\t"
+ : /* no output */
+ : "r" (mreg), "r" (mxcc_creg),
+ "r" (MXCC_CREG), "i" (ASI_M_MMUREGS),
+ "i" (ASI_M_MXCC)
+ : "g2", "memory", "cc");
+ *mregp = mreg;
+ *mxcc_cregp = mxcc_creg;
+}
+
+static inline unsigned long viking_hwprobe(unsigned long vaddr)
+{
+ unsigned long val;
+
+ vaddr &= PAGE_MASK;
+ /* Probe all MMU entries. */
+ __asm__ __volatile__("lda [%1] %2, %0\n\t"
+ : "=r" (val)
+ : "r" (vaddr | 0x400), "i" (ASI_M_FLUSH_PROBE));
+ if (!val)
+ return 0;
+
+ /* Probe region. */
+ __asm__ __volatile__("lda [%1] %2, %0\n\t"
+ : "=r" (val)
+ : "r" (vaddr | 0x200), "i" (ASI_M_FLUSH_PROBE));
+ if ((val & SRMMU_ET_MASK) == SRMMU_ET_PTE) {
+ vaddr &= ~SRMMU_PGDIR_MASK;
+ vaddr >>= PAGE_SHIFT;
+ return val | (vaddr << 8);
+ }
+
+ /* Probe segment. */
+ __asm__ __volatile__("lda [%1] %2, %0\n\t"
+ : "=r" (val)
+ : "r" (vaddr | 0x100), "i" (ASI_M_FLUSH_PROBE));
+ if ((val & SRMMU_ET_MASK) == SRMMU_ET_PTE) {
+ vaddr &= ~SRMMU_REAL_PMD_MASK;
+ vaddr >>= PAGE_SHIFT;
+ return val | (vaddr << 8);
+ }
+
+ /* Probe page. */
+ __asm__ __volatile__("lda [%1] %2, %0\n\t"
+ : "=r" (val)
+ : "r" (vaddr), "i" (ASI_M_FLUSH_PROBE));
+ return val;
+}
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* !(_SPARC_VIKING_H) */
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